11. e1c1  11... a7a6 [%c_arrow b7b5;keyPressed;none;from;b7;opacity;0.8;to;b5;persistent;false] Intending to advance the pawn to b5, starting counterplay on the queenside. 12. f4g5 A somewhat strange move that is not too dangerous. 12... d6e7  13. f3d2 